题解 | #完全数计算#
完全数计算
https://www.nowcoder.com/practice/7299c12e6abb437c87ad3e712383ff84
import java.util.Scanner
fun main(args: Array<String>) {
val read = Scanner(System.`in`)
val res = read.nextLine().toInt()
var sum = 0
for (j in 2 .. res) {
var mul = 1
for (i in 2 .. Math.sqrt(j.toDouble()).toInt()) {
if(j % i == 0) mul += i + j/i
}
if(mul == j) {
sum ++
}
}
print(sum)
}
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